抄録
A continuous recording technique of the systolic blood pressure during work has been developed. A blood flow detector by means of a CdS-cell applied of a finger or an ear-lobe was combined with an air compressor through an and-or-not circuit which worked to keep the air cuff pressure approximate to the systolic blood pressure. Ear-lobe application was preferred in case of motor-car drivers. A polygraphic recording during the motor-way driving revealed that the blood pressure increased by 35-40mmHg or even more at the maximum. Blood pressure level was not always parallel with heart rate variations. In critical cases of some drivers as in passing, a blood pressure level of more than 40-60mmHg higher than the resting level was observed. Personality of drivers seemed to have certain relations with blood pressure increase during driving.
